Condensed Consolidated Statement of Cash Flows (Unaudited) (Parenthetical) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statement of Cash Flows [Abstract]
Increase to property, plant and equipment	$ (171,032)	$ (107,660)
Changes in related accounts payable and accrued liabilities	10,252	(31,017)
Property, plant and equipment additions, net of equity AFUDC*	$ (160,780)	$ (138,677)